Color Rendering Index
Color Rendering Index (CRI) indicates a lamps ability to reproduce colors when compared to an ideal color source. A lower CRI means some distinctions between colors are lost. Higher CRI lamps provide more vibrant, vivid colors.
The reliability of an LED luminaire is also dependent upon the driver. If this fails, the luminaire will also fail. Therefore it is important to make sure the driver has a suitable rated life or is easily replaceable.
The angle between the two directions opposite each other over the beam axis for which the luminous intensity is half that of the maximum luminous intensity. (See diagram.)
The color temperature rating is another important factor to take into consideration when choosing a lighting solution. On the lower end of the scale, the color emitted tends to be more warm or orange. This temperature is useful in public places to promote relaxation. On the higher end of the scale are the cool white/blue colors, commonly found in offices to promote concentration.
The extent to which an object is judged to emit more or less light. LEDs use less energy to produce the same (or higher) amount of brightness to help you save on your electric bill.
The (potentially visible) temporal variation of emitted light. While flickering is common in legacy lighting systems, LEDs eliminate this problem, even after years of use.
A unit of light received on a plane; measured using a light meter.
A part of the thermal system that conducts or convects heat away from sensitive components such as LEDs.